O.S. Engines 18TM Revo User Manual
Page 7
ENGINE CONSTRUCTION
With this engine, the piston will
feel tight at the top of its stroke
(TDC) when the engine is cold.
This is normal. The cylinder bore
has a slight taper. The piston
and cylinder are designed to
achieve a perfect running
clearance when they reach
operating temperature.
Cylinder Liner
When the engine is cold. When the engine-is hot.
Near TDC
Piston
Crankshaft
Slight taper
6
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